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根據(jù)中文、英文解釋或所給單詞，用正確形式填空

If a computer catches a ________ (something that causes computer problems), it'll cause a lot of problems.

根據(jù)中文、英文解釋或所給單詞，用正確形式填空

A lot of changes _______ (happen) in Nanjing in the past three years.

根據(jù)中文、英文解釋或所給單詞，用正確形式填空

Jim is always the first ________ (come) to school.

根據(jù)中文、英文解釋或所給單詞，用正確形式填空

Sometimes, the robot might make a_______ (problem) in my flat.

根據(jù)中文、英文解釋或所給單詞，用正確形式填空

Mum asked me to_________ (send, mail) this letter for her.

根據(jù)中文、英文解釋或所給單詞，用正確形式填空

It's _________ (not right) to spit in public.